/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

body.system-page {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: #f5f5f5;
    justify-content: flex-start;
    align-items: stretch;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    color: #fff;
    padding: 1rem 0;
}

header h1 {
    text-align: center;
}

/* Forms */
form {
    background-color: #fff;
    padding: 2rem;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    max-width: 900px;
    width: 100%;
    margin: 2rem auto;
}

form div {
    margin-bottom: 1rem;
}

form label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

form input[type="text"],
form input[type="email"],
form input[type="password"],
form input[type="phone"] {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

form button {
    background-color: #333;
    color: #fff;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
}

form button:hover {
    background-color: #555;
}

/* Messages */
.message {
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 4px;
}

.message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.message.info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* Navigation */
nav {
    background-color: #444;
    padding: 0.5rem 0;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
}



nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
}



/* Footer */
footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}

/* Main Content Layout */
.main-content {
    display: flex;
    flex: 1;
}

/* Left Sidebar */
.left-sidebar {
    position: sticky;
    top: 0;
    height: calc(100vh);
    overflow-y: auto;
    width: 250px;
    background-color: #fff;
    border-right: 1px solid #e9ecef;
    padding: 20px;
}

/* Content Area */
.content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    form {
        margin: 1rem;
    }
    
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    nav ul li {
        margin: 0.5rem 0;
    }
    
    .main-content {
        flex-direction: column;
    }
    
    .left-sidebar {
        position: relative;
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid #e9ecef;
    }
}